PM5345 datasheet(37/196 Pages) PMC

37 / 196 page

PM5345 S/UNI-155

DATA SHEET

PMC-930305

ISSUE 4

SATURN USER NETWORK INTERFACE

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE

Pin Name

Type

No.

Function

PAIS

Output

The path AIS (PAIS) signal is set high when

STS-path AIS is declared. This occurs when

an all ones pattern is observed in the pointer

bytes (H1, H2) for three consecutive frames.

Path AIS is removed when the same valid and

normal pointer is detected for three

consecutive frames or a legal pointer with an

active NDF is received. This alarm indication is

also available via register access. PAIS is

updated on the falling edge of RCLK.

PYEL

Output

The path yellow (PYEL) signal is set high when

STS-path yellow alarm is declared. This

occurs when bit 5 of the path status byte (G1)

is set high for ten consecutive frames. Path

yellow is removed when bit 5 of the G1 byte is

set low for ten consecutive frames. This alarm

indication is also available via register access.

PYEL is updated on the falling edge of RCLK.

TLAIS

Input

The active high transmit line alarm indication

(TLAIS) signal controls the insertion of line

AIS. Line AIS is inserted by overwriting the

SONET/SDH frame contents with all ones

(before scrambling). The section overhead is

not overwritten. This function can also be

performed via register access. Line AIS

insertion is internally synchronized to frame

boundaries. The TLAIS input takes

precedence over the TTOH and TTOHEN

inputs. TLAIS is sampled on the rising edge of

POCLK.

PM5345 Datasheet(PDF) 37 Page - PMC-Sierra, Inc

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